ST L5981

降压降压2.9V18V1A

Overview

Description The L5981 is a step-down switching regulator with a 1.5 A (min.) current limited embedded Power MOSFET, so it is able to deliver in excess of 1 A DC current to the load depending on the application condition. The input voltage can range from 2.9 V to 18 V, while the output voltage can be set starting from 0.6 V to VIN . Having a minimum input voltage of 2.9 V, the device is suitable also for a 3.3 V bus. Requiring a minimum set of external components, the device includes an internal 250 kHz switching frequency oscillator thatcan be externally adjusted up to 1 MHz. The VFQFPN8 package with an exposed pad allows reducing the RthJA down to approximately 60 °C/W.

Applications Consumer: STB, DVD, DVD recorder, car audio, LCD TV and monitors Industrial: chargers, PLD, PLA, FPGA Networking: XDSL, modems, DC-DC modules Computer: optical storage, hard disk drive, printers, audio/graphic cards LED driving

Features

• 1A DC output current

• 2.9 V to 18 V input voltage

• Output voltage adjustable from 0.6 V

• 250 kHz switching frequency, programmable up to 1 MHz

• Internal soft-start and inhibit

• Low dropout operation: 100 % duty cycle

• Voltage feed-forward

• Zero loads current operation

• Overcurrent and thermal protection

• VFQFPN8 3 mm x 3 mm package

Applications

• LED driving

• Consumer: STB, DVD, DVD recorder, car audio, LCD TV, and monitors

• Industrial: chargers, PLD, PLA, FPGA

• Networking: XDSL, modems, DC-DC modules

• Computer: optical storage, hard disk drive, printers, audio/graphic cards